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UNITED STATES
DEPARTMENT OF THE INTERIOR

Fred A. Seaton, Secretary

BUREAU OF RECLAMATION

Wilbur A. Dexheimer, Commissioner
Grant Bloodgood, Assistant Commissioner and Chief Engineer

TECHNICAL RECORD

of

DESIGN AND CONSTRUCTION

ENDERS DAM

Constructed 1947-1951

Frenchman-Cambridge Unit
Missouri River Basin Project

Denver, Colorado

April 1958

Engin. Library

ENDERS DAM
Missouri River Basin Project

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General Information
Purpose: Irrigation water, flood control, sediment retention, recreational facilities,

fish and wildlife preservation, and stream pollution abatement.
Location: On Frenchman Creek, a tributary of the Republican River, approximately

50 miles west of McCook, in Chase County, Nebraska.
Constructed: 1947-1951.
Water supply: Frenchman Creek.
Maximum flood: 9,000 second-feet (1940).

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Reservoir

Area: 2,557 acres.
Controlled storage: 80,730 acre-feet.
Irrigation storage: 36,013 acre-feet.
Dead storage: 8,467 acre-feet.
Flood storage: 30,040 acre-feet.
Surcharge: 6,210 acre-feet.

Dam

Type: Rolled earthfill and rockfill.
Foundation: Ogallala formation.
Slope protection: Riprap on gravel blanket on upstream face, rockfill on downstream

face.
Dimensions:
Height: 103 feet above streambed, 146 feet above excavation.
Crest length: 2,603 feet.
Crest elevation: 3137.5.
Volume: 1,600,000 cubic yards.
Slopes:
Upstream, 4 to 1 to 23.7-foot berm at elevation 3070, 3 to 1 to elevation 3115, and

2-1/2 to 1 to 30 foot crest at elevation 3137.5.
Downstream, 4 to 1 to 10-foot berm at elevation 3066.5, 2-1/2 to 1 to 10-foot berm

at elevation 3091.5, 2-1/2 to 1 to 10-foot berm at elevation 3117, and 2 to i to

crest.
Cutoff trench: 30-foot bottom width with 1-1/2 to 1 side slopes.
Greatest depth of excavation: 43 feet.

Dike

Type: Rolled earthfill and rockfill.
Foundation: Loess.
Slope protection: Riprap on upstream face from station 99+39 to station 142+50,

selected material on upstream face from station 142+50 to station

160+72, seeded topsoil on downstream face.
Dimensions:
Height: 26 feet above foundation.
Crest length: 6,133 feet.
Crest elevation: 3135.5.
Volume: 150,000 cubic yards.
Slopes:
Upstream, 3 to 1 from station 99+39 to station 142+50 and 8 to 1 from station

142+50 to station 160+72.
Downstream, 2 to 1.

Spillway and Outlet Works

Type of spillway: Gated concrete overflow-chute type with stilling basin.
Crest elevations: Spillway, 3097.0; outlet works, 3080.0.
Maximum discharge:

Spillway, 200,000 second-feet.

Outlet works, 1,448 second-feet.
Outlet conduit: 7 feet in diameter, 512 feet long.
Spillway gates: Six gates 50 by 30 feet in size.
Stilling basins:
Spillway, reinforced concrete with chute blocks and dentated end sills.

Outlet works, reinforced concrete with deflector wall.
Concrete: 45,627 cubic yards.
Reinforcing steel: 4,500,000 pounds.

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